Objectives: I can convert between Celsius and Kelvin temperature scales. I can explain what absolute zero is. Agenda: Catalyst Notes & Practice: Gases and temperature Thermometers Reading Activity Exit Slip: Temperature On your handout, draw and describe the solid, liquid, and gas shown here

 I can convert between Celsius and Kelvin temperature scales.  I can explain that there is no temperature lower than 0 degrees Kelvin (absolute zero).

 30 sec to think, then talk with the person next to you… be ready to share with the class: 1. Our new unit is gases. What is a gas? 2. How are gases similar or different from liquids or solids?

Characteristics of Gases 1.The distance between gas particles is much greater than the distance between particles of a liquid or solid. 2.Applying pressure to a gas compresses or pushes the particles closer together. 3.Unlike solids and liquids, gases completely fill their containers. 4.Gases have high kinetic energy because their particles move more than particles in a solid or liquid. 5.Gases do have mass. (We measured the mass of carbon dioxide in the baking soda/vinegar lab.)

 kinetic energy: the energy of an object that is due to the object’s motion.  Energy of motion temperature: a measure of the average kinetic energy of the particles in an object. How much kinetic energy the molecules have

 volume: a measure of the size of an object in three dimensional space.  How much space the molecules are filling up  pressure: the amount of force exerted per unit area on a surface.  How much the molecules are pushing on a surface

8 KelvinCelsius Abbreviation: K Example: 100K Abbreviation: ° C Example: 98° C Zero degrees Kelvin is called absolute zero. Absolute zero is the temperature at which all molecular motion stops. Absolute zero is -273° C. 273K is the freezing point of water0° C is the freezing point of water 373K is the boiling point of water100° C is the boiling point of water There are no negative Kelvin temperatures. Most of the world uses the Celsius scale on an everyday basis. In chemistry we use two temperature scales: Celsius and Kelvin

 The formula K = o C  Example: convert 33 o C to Kelvin: K = 33 o C = 306K  Example: convert 202K to Celsius: 202K = o C K - 273= -71 o C  Convert these temperatures to Kelvin  23 o C100 o C-173 o C  Convert these temperatures to Celsius  0K 123K 300K 9

K = o C  Convert these temperatures to Kelvin  23 o C100 o C -173 o C  Convert these temperatures to Celsius  0K 123K 300K 10

 Complete the practice problems at the bottom of your notes.  Get a stamp when you are done.

 Reading Activity: Thermometers Article  Read the article about thermometers and answer the reading focus questions on your own sheet of paper. (Standards 4e, 4f, and writing)  You may work quietly with a partner.  When you are done, check the answer key and try the extra practice problems on your worksheet.

 Bring a 2 Liter bottle!!!

 If you did not finish the article questions, it is due tomorrow. The article is posted on the class website.  Read Textbook pp Do problems pp. 45 #6, 7, 8, 12. (Videos and other resources posted on class website.)  Optional: Make Flashcards: temperature, pressure, volume, kinetic energy, celsius, Kelvin, absolute zero, solid, liquid, gas

1. What is temperature?  Temperature is a measure of the average kinetic energy of particles in an object. 2. Are there negative Kelvin temperatures? Why or why not?  There are no negative Kelvin temperatures because 0K is absolute zero. That is the lowest possible temperature because it is the temperature at which all molecular motion stops. 3. Convert the following: 0 o C = _____K 273K 1500 o C = ____K 1773K 1200K = _____ o C 927 o C 100K = _____ o C o C